This is emphatically not true in case of DeepL in my experience. I haven't tried Kagi but I wouldn't be surprised if they are using the same LLM that powers the

This is emphatically not true in case of DeepL in my experience. I haven't tried Kagi but I wouldn't be surprised if they are using the same LLM that powers their assistant for it. Also, this kind of claim is meaningless unless you specify the language being translated, because quality varies widely depending on that, even across popular languages, never mind small regional ones. If you try to translate, say, to Chechen using GPT-o3 or Gemini 2.5 Pro, don't expect that translation to be accurate or even grammatically correct.